http://llvm.org/bugs/show_bug.cgi?id=14448
Bug #: 14448
Summary: [loopvectorize] multiple vector loops generated from
single scalar loop
Product: libraries
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Keywords: code-quality
Severity: enhancement
Priority: P
Component: Loop Optimizer
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
I think this is a known issue but..
If you compile the following program with vectorize-loops enabled multiple
vector loops are generated because the scalar loop is processed by
LoopVectorize twice.
#include <numeric>
int foo(int *A, int n)
{
return std::accumulate(A, A + n, 0);
}
The generated code is correct but not desirable.
compile with:
clang++ -S -emit-llvm accum.cpp -O2 -mllvm -vectorize-loops -o -
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